How to Help With Grade 3 Subtraction With Borrowing
Published: July 2026
Grade 3 subtraction with borrowing moves beyond a single trade. Your child now sees three-digit numbers, multiple regrouping steps, and across-zeros problems such as 400 - 168. The main support parents can give is helping the student keep place value organized.
What your child is learning
In Ontario Grade 3, students subtract numbers up to 1,000 and explain their strategies. They are still using the same place-value idea from Grade 2, but the numbers have more columns. A problem like 536 - 278 may require regrouping in the ones column and again in the tens column.
The hardest version is subtraction across zeros. In 400 - 168, the ones column needs more ones, but the tens column has zero tens. The student must borrow from the hundreds, create 10 tens, and then trade one of those tens for 10 ones. Slow language beats shortcuts here.
Three common sticking points
1. Treating zero as a digit to ignore
Example: in 400 - 168, a child may try to do 0 - 8 or simply write 8. Say: "Zero means there are no ones here yet. Where can we get some?" This points them back to the hundreds column.
2. Losing track after two borrows
Example: in 536 - 278, 16 - 8 happens in the ones column, then 12 - 7 happens in the tens column. Have your child rewrite the regrouped top number above the problem before subtracting.
3. Word problems with extra information
Example: "A class sold 426 tickets in March and 189 in April. How many more were sold in March?" The word "more" signals a comparison, not addition. Ask what two quantities are being compared before any calculation starts.
How to practise
Use one focused worksheet at a time: ordinary borrowing first, then across-zeros, then word problems. If mistakes cluster around zeros, pause mixed review and spend one session only on across-zeros problems.
- Grade 3 subtraction worksheets
- Grade 3 subtraction with borrowing worksheets
- Subtraction across zeros worksheets
- Three-digit subtraction worksheets
- Grade 3 subtraction word problems
- Ontario Grade 3 math expectations
How to check the work
The best manual check is still inverse addition: answer plus the subtracted number should equal the starting number. If your child has several wrong answers, check the first regrouping mark, not only the final line.
Get Personalized Worksheets for Your Child
Gradulo creates custom worksheets based on your child's grade level and the Ontario curriculum. Print, practice offline, then scan for instant AI grading.